A slightly different perspective on this topic. In the days before loans of players, youngsters learned their trade in the Reserves, so it was common to realise that you had seen a future star years previously without knowing. A quick trawl of my (very patchy) collection of Utd Reserve programmes from the early 1960s provides (among others) these gems:
August 1963, v Blackpool, an 18-year-old Alan Ball, World Cup winner less than 3 years later.
October 1963, v Man Utd, Nobby Stiles, aged 20, another one shortly to win the World Cup.
September 1961, v Man Utd, Johnny Giles, age 20, another all-time great.
August 1962, v Everton, Howard Kendall, age 16, about to embark on a great career as a midfielder, and later as a manager, including at the Lane.
April 1962, v Bury, an even stronger future connection to United, with the appearance of a 17-year-old Eddie Colquhoun.
Other occasional matches at the Lane gave glimpses of future stars:
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Even more improbable is the following:
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The Derbyshire goalkeeper was Bob Wilson, Arsenal goalkeeper.